Preheat oven to 375°F (190°C). Spread tortilla chips evenly on a large, oven-safe platter or baking sheet lined with parchment paper.

In a skillet over medium heat, cook the sausage coins until browned and heated through (about 4-5 minutes). Remove from skillet and set aside.

In a bowl, whisk the eggs, milk, and a pinch of salt and pepper.

Heat butter or olive oil in the same skillet over medium heat.

Pour in the eggs and scramble gently until just set. Remove from heat.

Sprinkle half the cheddar and Monterey Jack cheeses over the tortilla chips. Add the cooked sausage, scrambled eggs, black beans, red onions, and tomatoes. Top with the remaining cheese.

Place the nachos in the preheated oven for 8-10 minutes, or until the cheese is fully melted. Remove from oven and top with green onions, cilantro, jalapeño slices (if using), avocado, and dollops of sour cream.

Add salsa or your favorite hot sauce on the side or drizzled over the nachos.